在一定条件下,对于密闭容器中进行的反应:H2(g)+I2(g)⇌2HI(g),下

题型:选择题

问题:

在一定条件下,对于密闭容器中进行的反应:H2(g)+I2(g)⇌2HI (g),下列说法能充分说明该反应已达到化学平衡状态的是(  )

A.正、逆反应速率都等于零

B.H2、I2、HI的浓度相等

C.H2、I2、HI在容器中共存

D.H2、I2、HI的浓度均不再变化

考点:达到化学平衡的标志
题型:选择题

简述世界生物柴油生产现状及发展趋势。

题型:选择题

某施工单位与建设单位按《建设工程施工合同(示范文本)》签订了固定总价施工承包合同,合同工期390天,合同总价5000万元。合同中约定按建标[2003]206号文综合单价法计价程序计价,其中间接费费率为20%,规费费率为5%,取费基数为人工费与机械费之和。施工前施工单位向工程师提交了施工组织设计和施工进度计划(图4-1)。

该工程在施工过程中发生了以下事件:

事件1:因地质勘探报告不详,出现图纸中未标明地下障碍物,处理该障碍物导致工作 A持续时间延长10天,增加人工费2万元、材料费4万元、机械费3万元。

事件2:基坑开挖时因边坡支撑失稳坍塌,造成工作B持续时间延长15天,增加人工费 1万元、材料费1万元、机械费2万元。

事件3:因不可抗力而引起施工单位的供电设施发生火灾,使工作C持续时间延长10天,增加人工费1.5万元、其他损失费5万元。

事件4:结构施工阶段因建设单位提出工程变更,导致施工单位增加人工费4万元、材料费6万元、机械费5万元,工作E持续时间延长30天。

事件5:因施工期间钢材涨价而增加材料费7万元。

针对上述事件,施工单位按程序提出了工期索赔和费用索赔。

施工单位租赁土方施工机械用于工作A、B,日租金为1500元/天,则施工单位可以得到的土方租赁机械的租金补偿费用是多少为什么?

题型:选择题

下列腧穴中,治疗急性胃病应首选

A.三阴交
B.梁丘
C.内庭
D.上巨虚
E.下巨虚

题型:选择题

Passage Three

Our culture has caused most Americans to assume not only that our language is universal but that the gestures we use are understood by everyone. We do not realize that waving good-bye is the way to summon a person from the Philippines to one’s side, or that in Italy and some Latin American countries, curling the finger to oneself is a sign of farewell.
Those private citizens who sent packages to our troops occupying Germany after World War II and marked them GIFT to escape duty payments did not bother to find out that "Gift" means poison in German. Moreover, we like to think of ourselves as friendly, yet we prefer to be at least 3 feet or an arm’s length away from others. Latins and Middle Easterners like to come closer and touch, which makes Americans uncomfortable.
Our linguistic (语言上的) and cultural blindness and the casualness with which we take notice of the developed tastes, gestures, customs and languages of other countries, are losing us friends, business and respect in the world.
Even here in the United States, we make few concessions (让步) to the needs of foreign visitors. There are no information signs in four languages on our public buildings or monuments; we do not have multilingual (多语言的) guided tours. Very few restaurant menus have translations, and multilingual waiters, bank clerks and policemen are rare. Our transportation systems have maps in English only and often we ourselves have difficulty understanding them.
When we go abroad, we tend to cluster in hotels and restaurants where English is spoken. Then attitudes and information we pick up are conditioned by those natives—usually the richer— who speak English. Our business dealings, as well as the nation’s diplomacy, are conducted through interpreters.
For many years, American dollars no longer buy all good things, and we are slowly beginning to realize that our proper role in the world is changing. A 1979 Harris poll reported that 55 percent of Americans want this country to play a more significant role in world affairs; we want to have a hand in the important decisions of the 21st century, even though it may not always be the upper hand.

It can be inferred that Americans being approached too closely by Middle Easterners would most probably ______.

A.stand still

B.jump aside

C.step forward

D.draw back

题型:选择题

急性中毒的神经系统表现不包括()

A.昏迷

B.惊厥

C.瘫痪

D.肌纤维颤动

E.休克

更多题库